Page 16 - Dairy Dimension - Jan

| Volume 1 | Issue 2 | Jan-Feb 2025 ARTICLE | Volume 1 | Issue 2 | Jan-Feb 2025

Yeast for the Rumen:

Active Dry Yeast, Yeast 9 -desaturase

Culture, or Yeast Cell trans-11 cis-9, trans-11 CLA

Wall—Does it Make Increased milk
yield and fat

a Difference?

and the fermentation conditions. components and yeast cell wall fragments, are
Sarwar Ali has a postgraduate degree in molecular biology and derived from lysed yeast cells using acids, enzymes,
management. With over a decade of experience in the feed 3. Yeast Cell Wall or high-salt solutions. Glucans, the principal
additives and vaccine business, he specializes in product Yeast autolysates, which include both intracellular
management, branding, and key account management. Table 1: Mode of action of active dry yeast, yeast culture and yeast cell wall
Currently, he holds the position of VP Sales & Marketing at Active dry yeast Yeast culture Yeast cell wall
Immeureka Animal Health.
Some studies suggest that ADY alters bacterial Yeast cultures are Supplementation with yeast cell wall has
populations in the rumen. ADY may help reduce distinctive due to the been shown to influence the rumen's
Sarwar Ali oxygen levels in the rumen, creating a more combination of yeast microbial environment, promoting the
Immeureka Animal Health favorable environment for anaerobic, cellulolytic biomass and fermentation growth of lactate-fermenting bacteria and
bacteria. metabolites. These reducing lactate concentration in the
It has been also suggested that ADY's disintegrate micronutrients stimulate rumen. Mannan oligosaccharides
The addition of direct feed microbes can enhance feed Different Yeast Species of Importance in Animal in rumen and acts as micronutrients that stimulate the growth of rumen stimulate beneficial lactic acid bacteria,
the proliferation of rumen microbial growth. microbes. promoting their growth and
digestion, improve animal performance, and support Feeding gastrointestinal viability.
animal health by influencing the rumen's digestive 1. Active Dry Yeast (ADY)
processes. As a result, ruminants are commonly fed Active dry yeast is the most common type used in Following table summarizes a review of literature studies reporting an improvement in dairy cow's performance and
various microbial feed additives. Yeast products, dairy and cattle feeds. It is a granular substance udder health due to feeding of active dry yeast, yeast culture and yeast cell wall.
particularly Saccharomyces cerevisiae, have been shown containing live organisms in a dormant state, with Table 2: Effect of Yeast Products Supplementation on Milk Quantity and Quality of Dairy Cows
to be effective in regulating rumen metabolism and 5–20 billion live yeast cells per gram. There is a wide Yeast Species/Type Period Fed Diets Dosage Improved Parameters References
improving ruminant productivity. Research suggests that range of commercial ADY products available in the
Yeast Cell Wall 14 weeks 28 g/cow per day Increased milk production Nocek et al. (2011)
supplementing yeast in the diet can improve feed intake, dairy nutrition market, each containing a distinct (Saccharomyces and milk protein
weight gain, digestion, and the populations of anaerobic strain of Saccharomyces cerevisiae, with varying cerevisiae)
and cellulolytic bacteria (ruminal microflora), as well as dosing rates and cell viability. Active Dry Yeast 10 weeks 8×10?10 CFU 4% fat-corrected Aizahal et al. (2014)
stabilize the ruminal pH. 2. Yeast Cultures (Saccharomyces /head/ day milk yield increase
cerevisiae)
However, there has been ongoing debate regarding Yeast cultures are unique in that they contain both
whether yeast should be fed as active dry yeast (ADY), yeast biomass and fermentation metabolites Yeast Cell Wall 10 weeks 10 g/cow/day Improved milk production Aung et al. (2019)

and composition, and better
(Saccharomyces
yeast culture, or yeast cell wall. The goal of produced during the fermentation process. To cerevisiae) blood energy metabolites
supplementing yeast in ruminant diets is to improve produce yeast cultures, live yeast cells are Yeast Culture
animal health and production efficiency, while also inoculated into a specific medium and allowed to (Inactivate strains of 6 months 40 g/head/day Increased 4% FCM milk Wafa et al. (2020)
ferment under controlled conditions. The
considering cost-effective applications. Saccharomyces yield, milk fat, total solids,
metabolites produced depend on the media used cerevisiae) and solids-not-fat

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